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3,858 Matching Results
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MODELING THE TRANSPORT AND CHEMICAL EVOLUTION OF ONSHORE AND OFFSHORE EMISSIONS AND THEIR IMPACT ON LOCAL AND REGIONAL AIR QUALITY USING A VARIABLE-GRID-RESOLUTION AIR QUALITY MODEL
None
Date:
May 17, 2004
Creator:
Alapaty, Kiran
Object Type:
Report
System:
The UNT Digital Library
Portable and Transparent Message Compression in MPI Libraries to Improve the Performance and Scalability of Parallel Applications
The goal of this project has been to develop a lossless compression algorithm for message-passing libraries that can accelerate HPC systems by reducing the communication time. Because both compression and decompression have to be performed in software in real time, the algorithm has to be extremely fast while still delivering a good compression ratio. During the first half of this project, they designed a new compression algorithm called FPC for scientific double-precision data, made the source code available on the web, and published two papers describing its operation, the first in the proceedings of the Data Compression Conference and the second in the IEEE Transactions on Computers. At comparable average compression ratios, this algorithm compresses and decompresses 10 to 100 times faster than BZIP2, DFCM, FSD, GZIP, and PLMI on the three architectures tested. With prediction tables that fit into the CPU's L1 data acache, FPC delivers a guaranteed throughput of six gigabits per second on a 1.6 GHz Itanium 2 system. The C source code and documentation of FPC are posted on-line and have already been downloaded hundreds of times. To evaluate FPC, they gathered 13 real-world scientific datasets from around the globe, including satellite data, crash-simulation data, and …
Date:
April 17, 2009
Creator:
Albonesi, David & Burtscher, Martin
Object Type:
Text
System:
The UNT Digital Library
Overview of Grand Unified Models and their predictions for neutrino oscillations
A brief overview of Grand Unified Models is presented with some attention paid to their predictions for neutrino oscillations. Given the well-known features of the two non-unified standard models, SM and MSSM, a listing of the features of classes of unified models is given, where a GUT flavor symmetry and/or family symmetry are introduced to reduce the number of model parameters. Some general remarks are then made concerning the type of predictions that follow for the neutrino masses and mixings.
Date:
August 17, 2000
Creator:
Albright, Carl H.
Object Type:
Article
System:
The UNT Digital Library
Aluminum-Oxide Temperatures on the Mark VB, VE, VR, 15, and Mark 25 Assemblies
The task was to compute the maximum aluminum-oxide and oxide-coolant temperatures of assemblies cladded in 99 plus percent aluminum. The assemblies considered were the Mark VB, VE, V5, 15 and 25. These assemblies consist of nested slug columns with individual uranium slugs cladded in aluminum cans. The CREDIT code was modified to calculate the oxide film thickness and the aluminum-oxide temperature at each axial increment. The information in this report will be used to evaluate the potential for cladding corrosion of the Mark 25 assembly.
Date:
July 17, 2001
Creator:
Aleman, S. E.
Object Type:
Report
System:
The UNT Digital Library
Aluminum-Oxide Temperatures on the Mark VB, VE, VR, 15, and Mark 25 Assemblies
The task was to compute the maximum aluminum-oxide and oxide-coolant temperatures of assemblies cladded in 99+ percent aluminum. The assemblies considered were the Mark VB, VE, V5, 15 and 25. These assemblies consist of nested slug columns with individual uranium slugs cladded in aluminum cans. The CREDIT code was modified to calculate the oxide film thickness and the aluminum-oxide temperature at each axial increment. This information in this report will be used to evaluate the potential for cladding corrosion of the Mark 25 assembly.
Date:
July 17, 2001
Creator:
Aleman, S. E.
Object Type:
Report
System:
The UNT Digital Library
Federal Liability for Hurricane Katrina-Related Flood Damage
None
Date:
August 17, 2007
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Les Houches Physics at TeV Colliders 2005 Beyond the Standard Model Working Group: Summary Report
The work contained herein constitutes a report of the ''Beyond the Standard Model'' working group for the Workshop ''Physics at TeV Colliders'', Les Houches, France, 2-20 May, 2005. We present reviews of current topics as well as original research carried out for the workshop. Supersymmetric and non-supersymmetric models are studied, as well as computational tools designed in order to facilitate their phenomenology.
Date:
March 17, 2006
Creator:
Allanach, B. C.; Grojean, C.; Skands, P.; Accomando, E.; Azuelos, G.; Baer, H. et al.
Object Type:
Article
System:
The UNT Digital Library
Performance of a Drum Type Packaging with Urethane Foam Overpack Subjected to Crush and Other Regulatory Tests
In order to improve the melt rate of high level waste slurry feed being vitrified in the Savannah River Site's (SRS) Defense Waste Processing Facility (DWPF) Melter, a melter glass pump (pump 1) was installed in the DWPF Melter on February 10, 2004. The glass pump increased melt rate by generating a forced convection within the molten glass pool, thereby increasing the heat transfer from the molten glass to the unmolten feed cold cap that is on top of the glass pool. After operating for over four months, the pump was removed on June 22, 2004 due to indications that it had failed. The removed pump exhibited obvious signs of corrosion, had collapsed inward at the glass exit slots at the melt line, and was dog-legged in the same area. This lead to the pump being redesigned to improve its mechanical integrity (increased wall thickness and strength) while maintaining its hydraulic diameter as large as possible. The improved DWPF glass pump (pump 2) was installed on September 15, 2004. The impact of the new design on pump life, along with analysis of the glass pump's impact on melt rate in the DWPF Melter is discussed in this paper.
Date:
July 17, 2005
Creator:
Allen, Smith
Object Type:
Article
System:
The UNT Digital Library
The effect of low dose rate irradiation on the tensile properties and microstructure of austenitic stainless steel.
To assess the effects of long-term, low-dose-rate neutron exposure on mechanical strength and ductility, tensile properties were measured on 12% and 20% cold-worked Type 316 stainless steel. Samples were prepared from reactor core components retrieved from the EBR-II reactor following final shutdown. Sample locations were chosen to cover a dose range of 1-56 dpa at temperatures from 371-440 C and dose rates from 0.5-5.8 x10{sup -7} dpa/s. These dose rates are approximately an order of magnitude lower than those of typical EBR-II test sample locations. The tensile tests for the 12% CW material were performed at 380 C and 430 C while those for the 20% CW samples were performed at 370 C. In each case, the tensile test temperature approximately matched the irradiation temperature. To help understand the tensile properties, microstructural samples with similar irradiation history were also examined. The strength and loss of work hardening increase the fastest as a function of irradiation dose for the 12% CW material irradiated at lower temperature. The decrease in ductility with increasing dose occurs more rapidly for the 12% CW material irradiated at lower temperature and the 20% cold-worked material. Post-tensile test fractography indicates that at higher dose, the 20% CW …
Date:
September 17, 2002
Creator:
Allen, T. R.; Tsai, H.; Cole, J. I.; Yoshitake, T.; Akasaka, N.; Donomae, T. et al.
Object Type:
Article
System:
The UNT Digital Library
LED-induced fluorescence diagnostics for turbine and combustion engine thermometry
Fluorescence from phosphor coatings is the basis of an established technique for measuring temperature in a wide variety of turbine and combustion engine applications. Example surfaces include blades, vanes, combustors, intake valves, pistons, and rotors. Many situations that are remote and noncontact require the high intensity of a laser to illuminate the phosphor, especially if the surface is moving. Thermometric resolutions of 0.1 C are obtainable, and some laboratory versions of these systems have been calibrated against NIST standards to even higher precision. To improve the measurement signal-to-noise ratio, synchronous detection timing has been used to repeatedly interrogate the same blade in a high speed rotating turbine. High spatial resolution can be obtained by tightly focusing the interrogation beam in measurements of static surfaces, and by precise differential timing of the laser pulses on rotating surfaces. We report here the use of blue light emitting diodes (LEDs) as a n illumination source for producing useable fluorescence from phosphors for temperature measurements. An LED can excite most of the same phosphors used to cover the temperature range from 8 to 1400 C. The advantages of using LEDs are obvious in terms of size, power requirements, space requirements and cost. There can …
Date:
August 17, 2001
Creator:
Allison, S. W.
Object Type:
Article
System:
The UNT Digital Library
Thermal-stress analysis of the high heat-load crotch absorber at the APS.
The Advanced Photon Source (APS) storage ring operation at higher beam current is one of the potential enhancements to increase beam brilliance. However, this would impact the beamline components and high heat-load crotch absorbers. Thus, this analysis is conducted to better understand the impact of higher beam current on water-cooled crotch absorbers, made out of Glidcop, without introducing any heat-related problems.
Date:
September 17, 2002
Creator:
Alp, A.
Object Type:
Article
System:
The UNT Digital Library
Nonradiological Environmental Report Maamora Site, Morocco
Under the Sister Laboratory Arrangement between Lawrence Livermore National Laboratory (LLNL) and the Moroccan National Center for Nuclear Energy Sciences and Techniques (CNESTEN), environmental sampling and analysis were performed to assess the background concentrations of nonradiological constituents in various environmental media at the Maamora Forest CNESTEN Laboratory Site. Samples were collected from surface soil, surface water and groundwater wells, short-lived vegetation (mainly native grass), and long-lived vegetation (cork oak). Samples were collected inside the property fence line, in the buffer zone surrounding the site, and off site at water locations. The soil and vegetation samples were analyzed for metals and pesticides and screened for polychlorinated biphenyls (PCBs); the water samples were analyzed for metals, general minerals, and pesticides and screened for PCBs.
Date:
July 17, 2003
Creator:
Althouse, P E; Blake, R G; Bandong, B B; Belghit, H & Dehbi, N
Object Type:
Report
System:
The UNT Digital Library
Development and Coil Fabrication for the LARP 3.7-m Long Nb3Sn Quadrupole
The U.S. LHC Accelerator Research Program (LARP) has started the fabrication of 3.7-m long Nb{sub 3}Sn quadrupole models. The Long Quadrupoles (LQ) are 'Proof-of-Principle' magnets which are to demonstrate that Nb{sub 3}Sn technology is mature for use in high energy particle accelerators. Their design is based on the LARP Technological Quadrupole (TQ) models, developed at FNAL and LBNL, which have design gradients higher than 200 T/m and an aperture of 90 mm. The plans for the LQ R&D and a design update are presented and discussed in this paper. The challenges of fabricating long accelerator-quality Nb{sub 3}Sn coils are presented together with the solutions adopted for the LQ coils (based on the TQ experience). During the fabrication and inspection of practice coils some problems were found and corrected. The fabrication at BNL and FNAL of the set of coils for the first Long Quadrupole is in progress.
Date:
August 17, 2008
Creator:
Ambrosio, G.; Andreev, N.; Anerella, M.; Barzi, E.; Bossert, R.; Caspi, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Congressional Record: Its Production, Distribution, and Accessibility
Congressional Record.This report provides information about the Production, Distribution, and Accessibility of Congressional Record. The Congressional Record is the most widely published account of the debates and activities in congress.
Date:
July 17, 2003
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
Congressional Gifts and Travel: Legislative Proposals for the 109th Congress
The House and Senate examined their rules on the acceptance of gifts and travel expenses. Press accounts of alleged excesses in privately funded congressional travel and gifts, particularly from lobbyists, have provided an impetus for proposed changes in the 109th Congress. This report provides an analysis of the proposals for change introduced or discussed in the 109th Congress and will be updated as events warrant.
Date:
January 17, 2006
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Congressional Record: Its Production, Distribution, and Accessibility
The Congressional Record is the most widely recognized published account of the debates and activities in Congress. The Record often reflects the intent of Congress in enacting legislation. This fact sheet is one of a series on the legislative process.
Date:
July 17, 2003
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
The First Day of a New Congress: A Guide to Proceedings on the House Floor
The House of Representatives follows a well established routine on the opening day of a new Congress. The proceedings include election of the Speaker, swearing in its members, election of administrative officers, and adoption of rules of procedure. Also, resolutions assigning its members to committees may be adopted. The House must take these actions at the beginning of each new Congress because it is not a continuing body. Article 1, Section 2 of Constitution sets terms for Members of the House at two years. Thus, the House ends at the conclusion of each two-year Congress and must reconstitute itself at the beginning of a new Congress. This report focuses on the floor activities of the House during its first formal session in a new Congress, and serves as a guide for participating in or watching those proceedings.
Date:
August 17, 2005
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Pages of the United States Congress: Selection, Duties, and Program Administration
None
Date:
July 17, 2003
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Secret Sessions of the House and Senate
None
Date:
July 17, 2003
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
A User's Guide to the Congressional Record
The Congressional Record is a substantially verbatim account of remarks made during the proceedings of the House and Senate, subject only to technical, grammatical, and typographical corrections. It consists of four main sections: the proceedings of the House and Senate, the Extensions of Remarks, and the Daily Digest. This fact sheet is one of a series on the legislative process.
Date:
July 17, 2003
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Women in the United States Congress: 1917-2004
This report identifies the names, committee assignments, dates of service, and (for Representatives) districts of the 219 women Members of Congress.
Date:
March 17, 2004
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
An unsymmetrized multifrontal LU factorization
A well-known approach to compute the LU factorization of a general unsymmetric matrix bf A is to build the elimination tree associated with the pattern of the symmetric matrix A + A{sup T} and use it as a computational graph to drive the numerical factorization. This approach, although very efficient on a large range of unsymmetric matrices, does not capture the unsymmetric structure of the matrices. We introduce a new algorithm which detects and exploits the structural unsymmetry of the submatrices involved during the process of the elimination tree. We show that with the new algorithm significant gains both in memory and in time to perform the factorization can be obtained.
Date:
July 17, 2000
Creator:
Amestoy, Patrick R. & Puglisi, Chiara
Object Type:
Report
System:
The UNT Digital Library
APMS SVD methodology and implementation
One of the main tasks within the Aviation Performance Measurement System (APMS) program uses statistical methodologies to find atypical flights. With thousands of flights a day and hundreds of parameters being recorded every second for each flight, the amount of data escalates and the ability to find atypical flights becomes more difficult. The purpose of this paper is to explain the method known as single value decomposition (SVD) employed to search for the atypical flights and display useful graphics that facilitate understanding the causes of atypicality for these flights. Other methods could also perform this search and some are planned for future implementation.
Date:
April 17, 2000
Creator:
Amidan, B. G. & Ferryman, T. A.
Object Type:
Report
System:
The UNT Digital Library
Statistical Analyses of Second Indoor Bio-Release Field Evaluation Study at Idaho National Laboratory
In September 2008 a large-scale testing operation (referred to as the INL-2 test) was performed within a two-story building (PBF-632) at the Idaho National Laboratory (INL). The report “Operational Observations on the INL-2 Experiment” defines the seven objectives for this test and discusses the results and conclusions. This is further discussed in the introduction of this report. The INL-2 test consisted of five tests (events) in which a floor (level) of the building was contaminated with the harmless biological warfare agent simulant Bg and samples were taken in most, if not all, of the rooms on the contaminated floor. After the sampling, the building was decontaminated, and the next test performed. Judgmental samples and probabilistic samples were determined and taken during each test. Vacuum, wipe, and swab samples were taken within each room. The purpose of this report is to study an additional four topics that were not within the scope of the original report. These topics are: 1) assess the quantitative assumptions about the data being normally or log-normally distributed; 2) evaluate differences and quantify the sample to sample variability within a room and across the rooms; 3) perform geostatistical types of analyses to study spatial correlations; and 4) …
Date:
December 17, 2009
Creator:
Amidan, Brett G.; Pulsipher, Brent A. & Matzke, Brett D.
Object Type:
Report
System:
The UNT Digital Library